The reaction sequence shows how CH₃CH₂ can be converted into BrCH₂CH₂Br
CH₃CH₃ + Cl₂ → Step A
NaOH → Step B
CH₃CH₂OH → Step C
BrCH₂CH₂Br + Br₂ → Step D
Which step occurs by nucleophilic substitution? - AQA - A-Level Chemistry - Question 14 - 2017 - Paper 3
Question 14
The reaction sequence shows how CH₃CH₂ can be converted into BrCH₂CH₂Br
CH₃CH₃ + Cl₂ → Step A
NaOH → Step B
CH₃CH₂OH → Step C
BrCH₂CH₂Br + Br₂ → Step D
Which step ... show full transcript
Worked Solution & Example Answer:The reaction sequence shows how CH₃CH₂ can be converted into BrCH₂CH₂Br
CH₃CH₃ + Cl₂ → Step A
NaOH → Step B
CH₃CH₂OH → Step C
BrCH₂CH₂Br + Br₂ → Step D
Which step occurs by nucleophilic substitution? - AQA - A-Level Chemistry - Question 14 - 2017 - Paper 3
Step 1
Step A
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Answer
Step A involves the reaction of ethane (CH₃CH₃) with chlorine (Cl₂) in a halogenation reaction, which is not a nucleophilic substitution.
Step 2
Step B
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Answer
Step B is where sodium hydroxide (NaOH) reacts with CH₃CH₂Cl (ethyl chloride). This reaction is a classic example of nucleophilic substitution (S_N2) as the hydroxide ion acts as a nucleophile, replacing the chlorine atom.
Step 3
Step C
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Answer
Step C involves the alcohol formation where CH₃CH₂OH does not involve nucleophilic substitution but rather involves proton transfer.
Step 4
Step D
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Step D is the bromination of dibromide, which does not involve nucleophilic substitution either.
